Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e51e173479fb836326f78a9b46905c94490be3b11a47ebfb51cba362c5ccbe4' 
  AND token = 'yuJWxEpj8J8KlMSvWnHAy5qLqTntvfY9zWzzP2HQ3hU=' 
  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"
    }
  }
}