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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee19b4479f69cbf0c9ec1beb6f2098228e838483262aff63b99598ee268e0a68' 
  AND token = '6yal7kZLX8YDEoc5OHrD17gWRsI3lZu2SOvA/8VK+lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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