Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708eb419ab59bac5f9639147175eeb2c8a40f327d18ea269e8c38a92f9a8a54' 
  AND token = 'oLPyo4auO/BgACkbU9dN/MMTNUkMrTfkU+CpgF6QSB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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