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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '885eee5caf35c5ad3d0d26079537c7916589699d6dd94b8a800da923f5b3d2ed' 
  AND token = 'zFYU0GiKg02S04zr1vZucwryPisOn7NG98V2ZoSRn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00764

JSON explain

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