Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238c633e34a73994439b4ebd3104afb4441da0c76b46cb4bb92bbef6c9cc9fa7' 
  AND token = 'NgU7ccuCISxgpnz6KszF/Hqj4SiPNAnMm08d8sg4HnE=' 
  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"
    }
  }
}