SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17509b0275971228d3daf3e6867b795d5b65cb393464b3267d7e5ffba1667f4' 
  AND token = '+G0QZWutT1m+P/HxCkARI/zsxebfa/uZjDBNXzQVG0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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