Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3b3ee4b9c1b75ff3d8d69cfd874285587d1b1fbdee8b1108cdcb10e5eeb9fe' 
  AND token = 'sLo4OX3Cjunqm2vwZ7/C1zdlIbYmAuPvrOm2Y4DOl9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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