Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd663f0c90594381738ade993c2caecd234136c8c8e3c5a2ed16ed42a1f737bb' 
  AND token = 'l89GgYAs+dkd0a/uLGfMe9l1YYPiuDh973u+0S1GRJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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