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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568a237688962838da0f705c8c6b6fd0ee2fb3c69839ada14bc90186c2ac3ef0' 
  AND token = 'POM1rWbmmlS1h9zxN7tA0SykNH0HaFoP/sL0IMtGHqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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