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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5dd1781ffa8bb6d52744323e3dbaaa9f940a1a51f0ca6047a77d5789f583ef40' 
  AND token = 'zSlFiJ61R/v83MS/dnFn7yKIo4slmn1T44vhQH6wPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00960

JSON explain

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