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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '797c8dfeed771e199605778db28191efa8b0056d10a2847608dbbde1e6c31b1d' 
  AND token = 'P/ZWeJ5PHyz/DrYn0Lj2JxlBaVcEARNZMxp7IOT/oLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01487

JSON explain

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