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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '504bcbd21fd992d0c65f8811a59f8efd765f6d3c72b8acfe27371e58cc4599fe' 
  AND token = 'R0iscN+LfVyr2SgZkmNJNcdxIKLAwrS5tEBxSz6/kDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00948

JSON explain

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