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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5b7f8216b019b512fec32e08e1cc306576da70fcb288b88d762d8242aae359ca' 
  AND token = 'iqgRMP9S296QKvB8H4zXc6TWkQz2Kd1Hmbe9Hk61zlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00809

JSON explain

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