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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ad33e3da5ce170fa47fe7e2c1d7062ce977deee6eede8c5bca8211b707d952' 
  AND token = '3LT9fBLkpHWCAY4nui5ug7lNUITOOLrKwv1zws9e85A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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