SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd5071c204640ba9f558e9533ba1e6549168fef76b7b287f55b3450a33a0e56' 
  AND token = 'tFmn+1VZLG+P9xF15KMYf8IhvmrurH6xv8nYFqUm16o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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