SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b5fc2406bf2c33797c14392b4641b53683312030162756f6ef015ddfd24989' 
  AND token = 'S1o/9byKJGvu4YI0ltdTSJmZjGGW9LuTRzfvmQO1jU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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