SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f661d3f80036a42ac904259c27fb017a5f3a672bb292c5138e1dfff8a12c19c6' 
  AND token = '3RBHq/AHekfCPfQwYh4siJhfAgpMqlV8UwHTFPE1nt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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