SELECT 
  1 
FROM 
  ushop_lock_keys 
WHERE 
  key_id = '47a83973d072d9037159af33fba670ac6ef4356bddbd4cf0be3ce9a1de70c704' 
  AND token = 'v8GZBVPcvUN12OeSYGYuuuDDGLdVXMwUxQmtglzGSjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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