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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373a05407d16c3fbf0e3330fb6fdd59730a44b91d0bfb5ab1957bacdf3d0f2c7' 
  AND token = '8vdrQZBKTI7kcyvRjczFbHhlyyCp0IFqlS1sY5NbxlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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