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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b573d70ef2bd183bef69096db9ed2f15acd75265c5db4beef1d7350d8ae718' 
  AND token = 'xUqBDGxNN0DGK+L/uuXzbSsEFj4Ratwq3Peq6N1goDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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