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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e583a403698d2c686cf711b5b067a94aa11ea890d3cb3ea847d14da0f1e43949' 
  AND token = 'd26PoQbmISwMscQ+CMIO2psfJIvzS7XISv+LGgcI7ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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