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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6b4be30a0c4e5bef3282fdf6fb4175c29285cea2c055fe8130a10c504d24bea6' 
  AND token = 'qy9sXTGS0py1ewrlwhrscLseCYhcpBPOe/NO9NXG25k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00874

JSON explain

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