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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '12f6ac2c895ba0eadcf7867d219a701d5aae8837d915d724819349699eaaa32a' 
  AND token = 'x+brUcrMb32PESNnTZPyY19p0exTzeU1cc0GdMjp+cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01083

JSON explain

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