Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f85949284c7823a732334584176b12a81e79184047f71b46eec249138c9e0bdb' 
  AND token = 'HV5o0SxnbfsiPIvfNZp5F4F33YsSq6395/ROPVNr3eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00785

JSON explain

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