Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a049d821fef71108c90bee5083a3e5a14a383f9761289ff943671ba3a8db3481' 
  AND token = 'j+uK1JT0cRfofMDgASL10mDUZWDS+Oka29lL+mN0Hok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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