SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c7c3055b03ad0eac2649626d5028428cfd19135396072a798f19b89154624f' 
  AND token = 'hEEhcp+hKCf+HKszWAyT6IrZayvC20ZAbyNKF/waPjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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