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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cbfb3653cd4cd3ca2146d60f2f9c3817dc55c1762078d6c8b3d02ff28d45d7' 
  AND token = 'cSXt2VvNKzCHRm9rOvgcBACMfUODEDUvY3ObrXPS3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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