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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e689b07094ab710cfe26a8f7270ba5c8db194e1bb9f53b03ad46142830c12b' 
  AND token = 'Pgoz8+tE484GzAN4yBjP897lU9Ul7hFEsOx/4a3CgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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