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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3953d03e85c289e621e5578f37387e9475f27b095487a9f7e7ba08b87c777ec' 
  AND token = 'tLNySlMEPa+J9kxD+YL8cL26xJ2VW8l/pozRnZuOs9g=' 
  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"
    }
  }
}