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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '52d3fe3ef3a188ce51c010ba28d9dd83e34cdb6f4449ad1c35c391ca1fd73596' 
  AND token = 'hXeTos6AxsSmMbctMtHZMrDdITR2j5cIkdbLIl8evns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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