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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '899bd79873bfdd5e1e41214bae962f79dedb378b309f26221179b9c33e4a5369' 
  AND token = 'hSy1bRd6X97koyV1syIdSjwG4waKif4b4giJ/AIiRqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00786

JSON explain

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