Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7c676407105d61813c5bdbded7a0590ab33531b6adc20c67815744fbad3864' 
  AND token = '5eFLj2Xyf0bu+Qzi98LCDynsi8kHxvncveh/91VjBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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