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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd193f79e0b93b59a3ff261743ba44d7081e04955e544c6b3466bf3d884075e51' 
  AND token = 'cEoVZL2wrhKCIdZwm4SpOo1o8Ysgf8jKSSCekQNeaZE=' 
  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"
    }
  }
}