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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5e9a5158db7f2086a04ccabf27af4593a92f79f6042bc357070634f9d264b81c' 
  AND token = 'mA8pmLXB4jh3Pm5bo0pCZwht68NnC351SATEA/oQouM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01553

JSON explain

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