SELECT 
  1 
FROM 
  ushop_lock_keys 
WHERE 
  key_id = '62df406e78256f51e1e2d5ea747878ae6361bf9aae9dfd4432b808934ffaf4a5' 
  AND token = 'GGOKa8pVG9ZUjfgLudRtFsrgwyMkJ5EdbCQfomXi7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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