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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238b93d5c958089485b95e1de5b3d1564a16b3e289fd07545b4b74cb7a10ade1' 
  AND token = '/pk7/enzjAPr0zGPgF16F8bdEAPm3+52mdDuvebrSCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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