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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'de9f402291708d1b772aeda42df0afb8df0a4a6cfdcd87cb0e38e923be040957' 
  AND token = 'LJRecFjEhEJunppNY1uGUNaXDjbCC+zzAisrJoaqxqI=' 
  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"
    }
  }
}