SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2a22f285402d3d08c8ea04f7bf467748345e130ca4ca28cdd48fc687b9633be2' 
  AND token = '9yFXpFk0Ti9SA5VgwoZhJltlBPVUJGX+EUjQUxmy7mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01500

JSON explain

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