SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a99ae76840f0635437f9e70c8c0db9653673faf84b2afcb981ff977861aaad' 
  AND token = 'Y13FoZaGSgZVWKUOLFHQhsuGKPeRPIsbNBawotqSAW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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