Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8303b2097670c9684fe430ac7002c7ed82e5d0a30a826afe771ff6fd831ab6' 
  AND token = 'Ct48fYEPsADXl8bKJIVFxbxL1mmsF0KAXsAoyaNCW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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