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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1efb454d54f8dfaa54365b25241bfa4de3ee4d057c2a7a2135eefad58feda66c' 
  AND token = 'Hq6a7n8BjeQHVko20k6RV7wnH7wgFeuy3j2V4UUQXlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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