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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd1f050598e03f79e8bf07c32519087f10e31faba6290a2b9c39bf96828611b15' 
  AND token = 'b7V/BEoHxtbv40ykfk+K4O+yCFAy8XFMWEszBygEWVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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