Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cea7e8766becac00e384eb8d987d1c49663a7d905aa50625004d8d6edd6cfe' 
  AND token = 'HSaP77/xW8OjIFQiTHadzVN6rXl5nfmW3UeGq/Q/S5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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