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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a8de625c6fc4fb983a73ae1ca51736c991c557a9f57ef9d48bca3f05cd9895' 
  AND token = 'U6qXVnbP8r2hQX/iSN608lV1sCecamzu0qoLWDYGA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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