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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9058f6b5964d570c57034ad5e7f961b4aa1ff91337903e2001e941ad8f957519' 
  AND token = 'TktUTtTq3aRYtGo+WBQnvIS1mswA+6TZm76p8eUSV1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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