Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6893edc3c008ecbcffd08a71ca9e520a071d5d75aafaae9df5765004b2738d3' 
  AND token = 'Dle665HSh78EL51JBK6xFiKWneE/hoR43QpaROhwdH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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