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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69492b7bb173a481e7873477fcd5b241ca97d2496e1879f6fb08092bedd272a6' 
  AND token = '5EcDFtVG7ob0WkiJ2kVrcGi2d8f42ub+LZL9C16rN3U=' 
  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"
    }
  }
}