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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4a1991e854e0b9a6ac0a551c654006133112cc8b66d8088a4ded2344b7f4ea80' 
  AND token = '6BMKyimh/mXMFOzLiEg9mak8fZ9hiQ00GeYAo1f6n7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00818

JSON explain

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