SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867b04766571eb65d91aceecdf148aaca817340cb9f05edd36958f56127ec075' 
  AND token = 'ESq8nknCpZgUjzUmYNIGbrFposrlVn7LrWlF/FwXcsY=' 
  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"
    }
  }
}