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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b1680f9fe280bcebb9bd38f4dbe6881ea65c1f071d81be3694fb3021e8c578f0' 
  AND token = 'Gqo0v9vXppO8WL3sa0bjn2/PEva/km0jjdzaj12hPwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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