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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50bfddddca31faf254f25c5de9bc5f98dd3e37b5255ae6309cba17a8bb4fcb5' 
  AND token = 'sErQ0m98M/Ulva11xJfDqx0K4AAkpGgDSMETcjKEbJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}