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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daafbc9a91bce18726f1e28410e22ff4db9023d95bb4a480b9c4c8b47bf36c9b' 
  AND token = 'siBcv7FnyuzdjPDUA4L9LaSzjvKwrZo/sy1muVfReW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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