Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5891161c2316495c0265431893d8f12420bd00df7b2d26a81ca6d53cdb2f51dd' 
  AND token = 'bd2qBBbS1EIPw2lqGBGzXzrFJb/K7M2JDhL3y4eX0Eo=' 
  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"
    }
  }
}