Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c55cd21a2d883d3cf426d440ab424ede778cee9eaebdf3352e7ae1b2d560aa' 
  AND token = '6i2IQpVDkbh9DKMpZ2Db4+yoefxuG62wWKZaQ0ycyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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