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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'efa16e9b613b7af6b9ea215e536565cb316926102604848962e0ff3fec9e706d' 
  AND token = 'V4e4NnElLrrPkq2TC+aznGabyCxTIYBeWZIPkQW3G3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00848

JSON explain

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