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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '79890856b911289cd832256c1fda02a603e8f4a7c24575a0002b0ed75ab05e81' 
  AND token = 'MQ4G1Dw/JIj8JmTI86VBNLnefST15yGEhQlVLv6cmxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00756

JSON explain

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