SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b44dedb009d14968c3a634bd5f086a982f535be8297fe67de8c71e87742035b' 
  AND token = 'AV/JNWYMhap0P02fQtirjBCAAmDzILw9KfCk4zqmuqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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