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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afc902104e81884b726575dbc4383a740e6338c21e6bb62eb505505c1e0a180' 
  AND token = 'ScxJGqsbvo6NQcU/Zgsb3TiHb75mqwuk3KhT7AHCVkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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