Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3db28f0251164c7ca90466acb3fe261565bbeb3a000f5848c06ea3753e86a04' 
  AND token = 'oQ+ndNI9QmK/9Z7tu08uMZXAbWxJoP1enOr0ZbFF810=' 
  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"
    }
  }
}