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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '88f71f11e39693a5874a20d55719d190c92838e90f2cb7a9bef5488d424034bd' 
  AND token = 'dmvFv0Lnb2vqAdk0MtGbnJFKQ+yzTFWh7LAwbKekI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00899

JSON explain

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