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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c781d1ebf01bb97a61b3493b8d45db7adb06d26f4a4c9685e7f178abd7600820' 
  AND token = 'OxU3wzO1FOFN+rLzATESllukkbYTpURoEumyZLdltdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00754

JSON explain

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