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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ac224c6ca8f93b03f86ca1d18c5bc994a0a262ac8d0e0d2291dd07cba64209d5' 
  AND token = 'mhOjAwPyhLaxG7QGoVankSnCGJ47cpBWBRX5JPvcVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00856

JSON explain

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