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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80cc03c826746b93569b994771d3f1eecf94f06ccd6378b71374b4c57bebb1d9' 
  AND token = 'hxSteCizl/TNUqlyQgLJt6ao3z0y/3510j0jmNZ8Ppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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