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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2d278c0af02461fcae1f4339fbc29a22751dcf284215ebc36043556d669b049e' 
  AND token = '2QqLUaS1FPoOXQgUm9RzDZUK8i1m1RmauWs09aZmzxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00855

JSON explain

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