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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af10a811a829d6d4d74b6d5254b2f8ba12836c54c81db9c3433b031b44db1fbb' 
  AND token = '4DzinUZZUYAFTI4eCxGGzLy+Chr/qR2m3NXb9zCAA/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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