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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1b8330b26a7f3628f3033542aad042ff0c35c9c8c81a6a0475055da74536b4' 
  AND token = 'M12S9yjbQYdG1V1zClg0Ile82jQ5EPRxUqHbWet7V3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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