Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ba01d3e6532b21c58c2b9ab4a93993cfdcdbd06ba9750795aed599d7f5378a' 
  AND token = 'DDffv28ygHs51tLUnZtQ4Md3x7efV5hwEz4GvLlj/gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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