Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0387982b6fdee7bb527f3b046c8f15969f4b715c889cb19f65298740bf975481' 
  AND token = '+Nk1frgxFnsG7JdgKbrcWWkN+87edYzmnV8dxmaK65A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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