SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa3a9966f5c8060ed15f2dbb353ff02bb0cea57eb83d62634a9c7fc7dd76071' 
  AND token = 'hza4haB31EqIvO2Pgnu4Bi8cVl31BKjt/4+IGugMbFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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