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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2658d23cd5a20ae91ee08633bff25bf30248df29eb2c54c50b43ac352e7802b5' 
  AND token = 'aucY9DQ6XnFsNvY8qheCCjoSlrl91zoJHMBQgUfA39k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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