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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e653e63e8b29400cc09a5556249aaf9fc5cfadfe405e9e8cf78c71498c117b0' 
  AND token = 'Q23r2KiZTVTIAXnGrSK73cU6QZiC2se5rSk9uqS8OgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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