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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1fca5fdb98e0e417c35fbf1308bb80a37b4f8f3f3996a6f80c86a992c46fd4f2' 
  AND token = '0IizQyQBVMXieR6XXy5gwFy+OMQXXGK+U070pelF/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00748

JSON explain

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