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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc5219812b9b202080cbe8b8789d429b9c6c41fe6e11b86de769045783c16de' 
  AND token = 'q9KTqKcmZkRRCp5gjrHQ140xxz7Tke8GFh75KmvjE5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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