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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a8be369582e49c7a988f91d6dc1ea48115738bf97600962543b45e178695c8dc' 
  AND token = 'uEbcxtwmefuYnQO8A9Xx6aeD8dUBWunzMuMOYXBX+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00791

JSON explain

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