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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a8a5ae92a5a0f6952e6d8fec5b729c58b19ad952ced53fba7d940906bf1a8eab' 
  AND token = 'rsObFi0fkHi9S/klW9bfRaLGWPcWF9Kvqfp+DdpkG7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00901

JSON explain

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