Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6d4967b5de6f036eaba7ac00ab27be724f24710afd23888cedf242d2577eca' 
  AND token = 'hXZ+bUXsQ4EQYV6KN/LVaOJk7/T54Aa85dz4b/Hw0Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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