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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '13c11afcc18fe5b8022b5900b1f91ef2321a230fe18a7041dae3f7cd157d5d3c' 
  AND token = 'lpFpyT8DKNVdmezXIjSDKOPP7IBXS0sjFKvX1sg3bdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00794

JSON explain

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