SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'aaae15f10d10ac9335f2b117942d29469981d3287b7fdde2bee60df37a62bfb9' 
  AND token = 'AqejgX+X0dsMPJLNFcwl79vXdSgBvWJ8NLqvwMGYjEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00897

JSON explain

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