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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9adcf173f9e9a91f9e36bc6eb651cdac3862c28dffb22fde8f112ff8a21b8266' 
  AND token = 'cWrz9YA1DZ5r9J3izKOKe22b32vkuJL2JFaSBIpwRw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00831

JSON explain

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