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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ecbff434cfc1842aaf4e24c2fbe5b863d601a2f8e77ad0e25e27ba70428fa3df' 
  AND token = 'E/DmOnYAGRYPFKniJkC128WE6cEtamhILV7aiRbufTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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