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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a7571bbde38ff1a1a1068ddc2844e75b8c7414e044dc8fdfeff6fbfe8058e7cb' 
  AND token = 'HapP/y7WOdnbIlpVhgz+LqxMzMI6cm42L7g1qyH5hNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00872

JSON explain

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