Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70e8cdeef2ace76e92a18a0d3d0696404a94b3b9d48658503746397ddb893bb' 
  AND token = 'P9l0Y8efaVQAKM6a8bM8o5v3F+1vLDnOGwg8FNtfTg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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