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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dab468d515c37895b746dde8e9f630898dcbb15fb5f4690bfe160b1329fed68' 
  AND token = 'q4EWy5xSIx08QMJbPvyIrJD59KVfuK/S7lTjlsyROo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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