SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45306643b41183fc6a0535441139931898439b12f4639707a502a870a5f5ed12' 
  AND token = 'c0lEUMQffhbQf/GCG96/lKXwY/7MwguWGjtCPB5iVn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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